<!doctype html>
<meta charset=utf-8>
<title>Node.appendChild: inserting script and source from a fragment</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<video id="media"></video>
<script>
const happened = [];
const media = document.getElementById("media");
test(() => {
  const source = document.createElement("source");
  const script = document.createElement("script");
  script.textContent = `
    happened.push(media.networkState);
  `;

  const df = document.createDocumentFragment();
  df.appendChild(script);
  df.appendChild(source);

  assert_array_equals(happened, []);
  media.appendChild(df);
  // This is because immediately during DOM insertion, before the
  // post-insertion steps invoke script, `<source>` insertion invokes the
  // resource selection algorithm [1] which does this assignment. This
  // assignment takes place before earlier-inserted script elements run
  // post-insertion.
  //
  // [1]: https://html.spec.whatwg.org/#concept-media-load-algorithm
  assert_array_equals(happened, [HTMLMediaElement.NETWORK_NO_SOURCE]);
}, "Empty <source> immediately sets media.networkState during DOM insertion, " +
   "so that an earlier-running script can observe networkState");
</script>
